Patent EA-000337-B1 (EA)
Title: Externally controlled application of compound in edges of cans
Inventor: PETER WOLFGANG
IPC: B65D53/06
Filed: 1996-08-05
Abstract: 1. Process for uniform applying fluid sealing material (compound; C, R) in oval or elongated oval in the body or cover hook (81; 81i; 81n; 81r) of a lid (D) to prepare a tight double seam closure in which a) a plurality of needles (30a, 30b, 30c, ..., 30x) or a continuous projecting ring (37) enter with their front ends (30a, 30b, 30c, ..., 30x) through one or several bottom openings (40a, 40b; 40x) of a container (43, 44, 40, 42) into a continuous application channel (48), formed by two delimiting edges (45b, 46b); b) all needles (30x) or continuous projecting ring (37) in the application channel (48) are axially adjusted from behind (31a, 32a,...;31x, 32x) without their ends (35a,...,35x, 38) at the channel side having to absorb axial adjusting forces from the body or cover hook (81n) to apply fluid sealing material through the continuous application channel (48) into the cover or body hook. 2. Process according to Claim 1, characterized in that when applying sealing material said front ends (35x) of said needles (30x) or face end (38a, 38) of said continuous projecting ring (37) do not touch the bottom (81n) in the body or cover hook (81; 81i; 81n; 81r) of said lid (D) to be coated with said fluid sealing material (C). 3. Process according to Claim 1 or 2, characterized in that said face end (38a, 38) of said continuous projecting ring (37) is widened in said continuous application channel (48) from the side face enabling to move upwards and downwards correspondingly, thus changing its position (x). 4. Process according to one of the preceding Claims, characterized in that when applying sealing material said front ends (35x) of said needles (30x) or face end (38a, 38) of said continuous projecting ring (37) when lowering to the sealing seat (33x, 41x) for applying the sealing material do not project over the bottom rims of the delimiting edges (45b, 46b) of the application channel. 5. Process according to Claim 4, characterized in that said delimiting edges (45b, 46b, 46') of said continuous application channel (48) have different length and/or said continuous projecting ring (37) is shifted laterally from said channel (48) centre so as to provide to pass flows of said liquid sealing compound (C, R) of different width. 6. Process according to one of the preceding Claims, characterized in that said front ends (35x) of said needles (30a, ..., 30x) or face end (38a, 38) of said continuous projecting ring (37) influence upon the flow volume of the sealing material through the end (33x) which can be conic, round, inclined on one side and stepped-cylindrical on the other side. 7. Process according to one of the preceding Claims, characterized in that the travel (x) of said needles (30x) or the circular projecting ring (37,38) is controlled by a synchronized adjustment device (22a, 22b, 21, 24a, 24b; 24c, 23a, 23b) that can be moved inside the ring-shaped content (V) of the container (40, 42, 43, 44) with said liquid sealing material in it. 8. Process according to Claim 7, characterized in that said synchronized adjustment device is axially moved by an adjustment sensor (20) arranged above the container (40, 42, 43, 44) for the sealing material, via (22a, 22b; 21) a sealing cover (42, 42a). 9. Process according to one of the preceding Claims, characterized in that in which said synchronized adjustment device complies with the cover shape (D) and, correspondingly, with the cover hook (81). 10. Process according to one of the preceding Claims, characterized in that due to the adjusting travel (x) of the needles (30x; x = a, b ...) or the continuous projecting ring (37) the flow volume can be changed by a corresponding lowering of the sealing seat (33a, ...; 33x; 41a, ...; 41x) in the bottom (40) of the container to control the flow volume of the liquid sealing material (C) through the bottom openings (40a, ...; 40x) of the container (40, 42, 43, 44). 11. Process for uniform applying fluid sealing material in which needles (30x; x = a, b, c ...) or the continuous projecting ring (37, 38) with a conic or stepped part (33a, 37a, 37b, 41c) so controllable change their position towards the sealing seat (41a, ...; 41x) in the container without exercising any force on the application point (81n) in such a way, that a determined amount of sealing medium with a variable width and thickness is applied into a groove or hook (81), the adjusting elements (x) (needles and projecting ring) are adjusted from behind in the axial direction (100a) depending on the result of the measurement of the width, thickness and/or position of the solidified sealing medium (R) in the groove or hook (81). 12. Process according to Claim 11, characterized in that the measurement of the thickness and the position of applying of the sealing medium (R) is controlled not for every cover, but after the predetermined laps of time to check the changing the number of the needles travels for applying the sealing medium. 13. Process according to Claim 11 and 12, characterized in that after the axial adjustment of the needles (30x) or the projecting ring (37) the measurement is repeated more often, until the stable thickness and the position of applying of the sealing medium (R) in the groove or hook are reached. 14. Apparatus for applying the process according to one of the preceding Claims, in which the adjusting device is provided with a plurality of needles (30x), arranged in a crown-shaped manner or one continuous projecting ring (36, 37, 38), which enter(s) through the bottom opening(s) (40x) of the container, characterized in that a) the container (40, 42, 43, 44) has a wall (44) that faces inwards and defines with the outer wall (43) the ring-shaped content (V)of he container, in which the adjustment device is arranged as a synchronized adjustment device (23a, 23b, 24a, 24b; 24c) that can be moved up and down in parallel to the inner wall (44).  b) the adjustment device (21) acts through the cover (42) of the container and can be mechanically actuated from the outside by the adjustment sensor (20). 15. Apparatus according to Claim 14, in which the continuous projecting ring, serving as a control ring (37), has at its end, opposite to the continuous application channel, an angle bracket (36) by which the ring is fastened to the lower side of the adjustment device (24c). 16. Apparatus according to Claim 14 or 15, in which the needles or the continuous projecting ring enter into the continuous application channel (48), made profiled and having periodically changing width (48', 48"), in particular has a bigger width (48") in the place, where the openings (40x) for the needles (30x) inter into the continuous application channel (48). 17. Apparatus according to one of Claims 14-16, in which the axial length of the continuous projecting ring (37) between the face end (38) and the stepped portion (37b) is chosen so as that at the initial stage the flow of the sealing material is cut on one or several edges (41c) of the bottom opening (40a) the face side (38) is still in the bottom opening (40a) and its delimiting edges (46b, 45b). 18. Apparatus according to Claim 14, in which a) the synchronized adjustment device has two ring holders (24a, 24b) arranged at a definite and constant distance from each other in which a plurality of equally spaced along the holder adjusting push rods (22a, 22b) are secured, said push rods are directed upwards and directed downwards needles (30x) with the parallel axes, said needles enable to move together with the parallel holders (24a, 24b) and the adjusting push rods (22a, 22b), or b) the synchronized adjustment device has a sliding belt (24c), which, by its wide inner surface (24b) adjoins the inner wall (44) enabling to slide, said belt can move up and down (x) using the adjusting push rods (22a, 22b)and on the bottom side of which the continuous projecting ring is fastened (36, 37, 38) 19. Apparatus according to Claim 18, alternative a) in which the needles (30x) are fixed rigidly in each annular collar (31a, 32a, 31b, 32b, ..., 31x, 32x) enabling to act them jointly. 20. Apparatus according to Claims 14-19 in which the ring holders (24a, 24b), or the sliding belt (24c), or the continuous projecting ring (37, 38) have the elongated oval body, corresponding to the shape of the hook or groove (81) into which the sealing material is to be applied. 21. Apparatus according to Claims 14-20, characterized in that the continuous projecting ring, serving as a control ring (37), has at one edge an inclined plane (47k) directed towards the zone of the sealing material application (R) and arranged near one of the delimiting edges (46b) of the application channel (48). 22. Apparatus according to Claims 14-21, in which the bottom opening (41a) is a continuous slot (40a) and the continuous projecting ring, serving as a control ring (37), has one or two closed inclined portions (37a), enabling to act with one or two inclined opposite portions (41a) on the inner edge of the bottom slot (40a) of the container bottom (40) to control the flow volume of the sealing material. 23. Apparatus according to Claims 14-21, in which the bottom opening (41a) is a continuous slot (40a) and the continuous projecting ring, serving as a control ring (37), has one or two-stepped closed inclined portions (37b), enabling to act with one or two inner edges (41c) of the bottom slot (40a) of the container bottom (40) to control the flow volume of the sealing material. 24. Apparatus according to Claim 23, in which a stepped portion is provided on the outer side of the control ring (37) to interact with the directed inwards edge (41c) of the bottom slot (40a) to control the flow volume of the sealing material, in particular to cut-out the flow. 25. Apparatus according to one of Claims 14-24, in which the width of the control ring (37) in the bottom slot is half the width of the bottom slot (40a). 26. Apparatus according to one of Claims 14-24, in which the width of th